Pd(II)-Catalyzed Primary-C(sp3)–H Acyloxylation at Room Temperature
摘要:
With the aid of a novel S-methyl-S-2-pyridyl-sulfoximine (MPyS) directing group (DG), the unactivated primary beta-C(sp(3))-H bond of MPyS-N-amides oxidizes at room temperature. The catalytic conditions are applicable to the diacetoxylation of primary beta,beta'-C(sp(3))-H bonds, and the carboxylic acid solvent is pivotal in the formation of the C-O bond. The MPyS-DG cleaves from the oxidation products and is recovered. This method provides convenient access to alpha,alpha'-disubstituted-beta-hydroxycarboxylic acids.
Pd(II)-Catalyzed Primary-C(sp3)–H Acyloxylation at Room Temperature
摘要:
With the aid of a novel S-methyl-S-2-pyridyl-sulfoximine (MPyS) directing group (DG), the unactivated primary beta-C(sp(3))-H bond of MPyS-N-amides oxidizes at room temperature. The catalytic conditions are applicable to the diacetoxylation of primary beta,beta'-C(sp(3))-H bonds, and the carboxylic acid solvent is pivotal in the formation of the C-O bond. The MPyS-DG cleaves from the oxidation products and is recovered. This method provides convenient access to alpha,alpha'-disubstituted-beta-hydroxycarboxylic acids.
Comparative Study of Metal-Catalyzed Iminations of Sulfoxides and Sulfides
作者:Olga García Mancheño、Carsten Bolm
DOI:10.1002/chem.200700352
日期:2007.8.6
A comparativestudy of the imination of sulfur compounds with various metal catalysts in combination with isolated or in situ generated iminoiodinanes (PhI==NR) as nitrogen sources is presented. The influence of the metal catalyst towards the imination of a variety of substituted sulfoxides has been evaluated. Moreover, the effect of the different oxidation states of sulfur on the reactivity and selectivity
Iron(II) Triflate as an Efficient Catalyst for the Imination of Sulfoxides
作者:Olga García Mancheño、Jonathan Dallimore、Andrew Plant、Carsten Bolm
DOI:10.1021/ol900660x
日期:2009.6.4
The challenging imination of benzyl-, sterically demanding alkyl-, and heteroaryl-substituted sulfoxides has been studied. Iron(II) triflate was identified as a highly efficient and robust catalyst for sulfur imination reactions. A variety of sulfoxides and sulfides were efficiently iminated with sulfonyliminoiodinanes (PhI═NSO2R) at room temperature to give the corresponding sulfoximines and sulfilimines